Raymarine Dragonfly Sonar GPS
Not just for anglers, sonar is useful for cruising sailors, too, for checking out bottom composition and detecting depths greater than those measured by most typical depth sounders.
The Dragonfly Sonar/GPS from Raymarine uses CHIRP technology to transmit across a wide spectrum of sonar signals, which results in photo-like high-resolution imagery.
$720, www.raymarine.com
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